VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/linux/thread-affinity-linux.cpp@ 46941

Last change on this file since 46941 was 37170, checked in by vboxsync, 13 years ago

linux affinity code.

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1/* $Id: thread-affinity-linux.cpp 37170 2011-05-20 17:15:07Z vboxsync $ */
2/** @file
3 * IPRT - Thread Affinity, Linux ring-3 implementation.
4 */
5
6/*
7 * Copyright (C) 2011 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*******************************************************************************
29* Header Files *
30*******************************************************************************/
31#ifndef _GNU_SOURCE
32# define _GNU_SOURCE
33#endif
34#include <features.h>
35#if __GLIBC_PREREQ(2,4)
36
37#include <sched.h>
38#include <unistd.h>
39#include <errno.h>
40#include <pthread.h>
41
42#include <iprt/thread.h>
43#include "internal/iprt.h"
44
45#include <iprt/assert.h>
46#include <iprt/cpuset.h>
47#include <iprt/err.h>
48#include <iprt/mp.h>
49
50
51
52RTR3DECL(int) RTThreadSetAffinity(PCRTCPUSET pCpuSet)
53{
54 /* convert */
55 cpu_set_t LnxCpuSet;
56 CPU_ZERO(&LnxCpuSet);
57 if (!pCpuSet)
58 for (unsigned iCpu = 0; iCpu < CPU_SETSIZE; iCpu++)
59 CPU_SET(iCpu, &LnxCpuSet);
60 else
61 for (unsigned iCpu = 0; iCpu < RT_MIN(CPU_SETSIZE, RTCPUSET_MAX_CPUS); iCpu++)
62 if (RTCpuSetIsMemberByIndex(pCpuSet, iCpu))
63 CPU_SET(iCpu, &LnxCpuSet);
64
65 int rc = pthread_setaffinity_np(pthread_self(), sizeof(LnxCpuSet), &LnxCpuSet);
66 if (!rc)
67 return VINF_SUCCESS;
68 rc = errno;
69 if (rc == ENOENT)
70 return VERR_CPU_NOT_FOUND;
71 return RTErrConvertFromErrno(errno);
72}
73
74
75RTR3DECL(int) RTThreadGetAffinity(PRTCPUSET pCpuSet)
76{
77 cpu_set_t LnxCpuSet;
78 int rc = pthread_getaffinity_np(pthread_self(), sizeof(LnxCpuSet), &LnxCpuSet);
79 if (rc != 0)
80 return RTErrConvertFromErrno(errno);
81
82 /* convert */
83 RTCpuSetEmpty(pCpuSet);
84 for (unsigned iCpu = 0; iCpu < RT_MIN(CPU_SETSIZE, RTCPUSET_MAX_CPUS); iCpu++)
85 if (CPU_ISSET(iCpu, &LnxCpuSet))
86 RTCpuSetAddByIndex(pCpuSet, iCpu);
87
88 return VINF_SUCCESS;
89}
90
91#else
92# include "../../generic/RTThreadGetAffinity-stub-generic.cpp"
93# include "../../generic/RTThreadSetAffinity-stub-generic.cpp"
94#endif
95
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